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Philosophical Magazine Volume 95, 2015 - Issue 7
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Part A: Materials Science

Mild degradation processes in ZnO-based varistors: the role of Zn vacancies

M.A. PonceInstitute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), Juan B. Justo 4302, B7608FDQMar del Plata, ArgentinaCorrespondence[email protected]
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,
C. MacchiInstituto de Física de Materiales Tandil (IFIMAT), CIFICEN, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) y Universidad Nacional del Centro de la Provincia de Buenos Aires, Pinto 399, B7000GHGTandil, Argentina;CONICET, Buenos Aires, ArgentinaView further author information
,
F. SchipaniInstitute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), Juan B. Justo 4302, B7608FDQMar del Plata, ArgentinaView further author information
,
C.M. AldaoInstitute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), Juan B. Justo 4302, B7608FDQMar del Plata, ArgentinaView further author information
&
A. SomozaInstituto de Física de Materiales Tandil (IFIMAT), CIFICEN, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) y Universidad Nacional del Centro de la Provincia de Buenos Aires, Pinto 399, B7000GHGTandil, Argentina;Consejo de Investigaciones Científicas de la Provincia de Buenos Aires, La Plata, ArgentinaView further author information
Pages 730-743 | Received 20 Jul 2014, Accepted 18 Dec 2014, Published online: 09 Feb 2015
 
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Abstract

The effects of a degradation process on the structural and electrical properties of ZnO-based varistors induced by the application of dc bias voltage were analysed. Capacitance and resistance measurements were carried out to electrically characterize the polycrystalline semiconductor before and after different degrees of mild degradation. Vacancies’ changes in the varistors were studied with positron annihilation lifetime spectroscopy. Variations on the potential barrier height and effective doping concentration were determined by fitting the experimental data from impedance spectroscopy measurements. These results indicate two different stages in the degradation process consistent with vacancy-like concentration changes.

Additional information

Funding

This work was partially supported by Agencia Nacional de Promoción Científica y Tecnológica (Argentina) (PICT 2011-1088), Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina) (PIP # 114-200801-00444 and PIP # 112-201101-00793), Comisión de Investigaciones Científicas de la Provincia de Buenos Aires and SECAT-UNICEN.

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